Web roll controlling mechanism



FIG.6. f

Dec. 18, 1934. LAMATSCH 1 1,984,749

WEB ROLL CONTROLLING MECHANISM Filed June '7, 1933 3 Sheets-Sheet l W h INVENTOR. H J N C Dec. 18, 1934. F. LAMATSCH WEB ROLL CONTROLLING MECHANISM Filed June 7, 1933 3 Sheets-Sheet 2 Dec. 1s 1934.

F. LAMATSCH WEB ROLL CONTROLLING MECHANISM Filed June 7, 1933 3 Sheets-Sheet 3 INVEN'I'OR Patented Dec. 18, 1934 WEB ROLL CONTRDLLING MECHANISM Frederick Lamatsch, Grantwood, N. J., assignor to Irving Trust Company, temporary trustee for R. Hoe & Co., Inc., New York, N. Y., a corporation of New York Application June 7, 1933, Serial No. 674,630

Claims. (01. 242-75) This invention relates to certain improvements in web controlling mechanism, that is, in devices for controlling the feeding of web material, and has been particularly designed for use in 5 controlling the feeding of web material in printing machines.

In feeding the web to the printing mechanism, it is desirable that the web be fed under such' tension as to produce good printing, such ten sion being called the normal running tension of the web. It is also desirable that this tension be maintained upon the web if slack should occur for any reason, as for instance, the web roll running ahead of the press on rapid press deceleration.

It is the object of this invention to take up slack in the web, if it should occur, by releasing a normally latched drop roller, which roller will fall by gravity a suflicient distance to take up the slack.

Generally speaking the particular mechanism provided to produce the above result comprises a releasable latching member adapted to maintain the drop'roll in a fixed position, a web tensioning roller mounted in floating bearings, one of which has a pin projecting therefrom normally held in engagement with a latch tripping member. While the web is moving under nor- -mal conditions or is maintained under normal tension, the tension roller bearings and the projecting pin and latch tripping mechanism are so positioned as to hold the drop roller in its latched condition, but as soon as any slack occurs in the web, the tension roller bearing will be forced upward under spring pressure, whereupon the projecting pin will trip the latch to release the drop roll. The drop roll, being pivotally mounted in suitable bearings will swing downward until the slack is taken up and when the movement of the web finally assumes its normal running speed, the drop roll will automatically become reengaged with the latching mechanism.

With the above and other objects not specifically referred to in view, the invention consists in certain novel parts, arrangements and combinations which will be fully described in connection with the accompanying drawings and the novel features pointed out in the claims hereunto annexed. y

In these drawings which show a preferred embodiment of the invention:-

Figure 1 is an end elevation, in diagrammatic form, embodying the improvements of the present invention;

Figure 2 is a detail side view of part of the construction shown in-Figure 1 on an enlarged scale, the view being partly broken away and partly in section;

Figure 3 is a view similar to Figure 2 showing the parts in a different position;

Figure '4 is a front view, partly in section of the construction shown in Figure 3, the view being taken in the direction of the arrow 4 of that figure;

Figure 5 is a fragmentary detail of a part of the construction shown in Figure 3, the view being taken in the direction of the arrow 5 of that figure; and

Figure 6 is a top or plan view of the construction shown in Figure 3, the view being taken in the direction of the arrow 6 of that figure.

Referring now to the drawings, the various parts of the mechanism are mounted in suitable side frames, one of which is indicated at 11.

The particular mechanism selected to illustrate the invention includes means for supporting a running roll R and a spare roll indicated-at S,-

these rolls being mounted so that they can be moved from loading tourunning position. It will be understood 0 f,.coiirse, that a single web roll may be use'd'or any suitable mechanism may be employed for supporting the running and one or more spare rolls. As shown the rolls are supported in suitable chucks 0r bearings 12, 13 formed in the ends of arms 14, one of which is shown in Figure 1, mounted on a shaft 15 which can be driven in any suitable manner to move in Figure 1, as to have a substantial wrap or lap around the surface of the unwinding roll R, the straps following the roll as it decreases in size so that the requisite tension is kept thereon.

In the particular construction illustrated, these tensioning straps 16 are supported at their lower ends by hooking them, by means of hooks 17,

around a bar or rod 18 mounted in block 19, suitably supported on the frame 11.. The other end of the straps 16 wind around suitable tensioning drums 21 mounted on shaft 22 in brackets 23 supported by the side frames 11.

The web marked W is led from'the running roll R under a guide roller 24, over a tension roller 25, then under a drop roll 26 and over and under guide rollers 27, 28 to the press.

Referring now to Figures 2 to 6 inclusive, the principal structure embodying this invention is there shown, and while the structure is illustrated as on one side frame only, it is to be understood that the opposite frame will be similarly arranged except for a latching mechanism, to be'hereinafter referred to, which will be mounted on only one side. It is therefore to be understood that all parts exclusive of the latching mechanism will be duplicated on the opposite side frame and that the description to follow will refer to the parts on one side of the machine.

The tension roller 25 is mounted in bearing blocks 29, said blocks having grooves 31-31 in the sides thereof which are adapted to be engaged by ways 3232 forming part of a supporting yoke 33, which supporting yoke is carried by the bracket 23 previously referred to. A compression spring 34 is compressed between the upper surface of the bearing block 29 and a cap 35 secured to the open end of the supporting yoke 33, and is retained in this position by a stud 36 secured to the upper surface of the bearing block 29, which stud passes through the spring 34 and has its upper end 37 in slidable engagement with a bearing 38 formed on the cap 35. Another compression spring 39 of heavier gauge is compressed between the lower surface of the bearing block 29 and the stud 41 which in turn is acted upon by adjusting screw 42, and is retained in this position partly by a pin 43 secured to the lower surface of the bearing block 29 which extends into the upper portion of the spring and by the position of the lower end in the opening 44 of the supporting yoke 33.

It will thus be observed that the tension roller bearing 25 is actually a floating bearing between the two compression springs 34, 39 which is normally forced upward to the position shown in Fi ure 2 when a slack occurs, due to the greater tension of the lower spring 39, and which assumes the position shown in Figure 3 when the press is running under normal conditions. By means of the adjusting screw 42, the normal tension of the lower spring 39 may be increased if desired.

A drop roll latching mechanism, designated generally by the reference character 45, is mounted on the supporting yoke 33, and comprises a latch lever 46 pivotally mounted on a stud 47, projecting from a bracket 48 secured to the supporting yoke 33, and has a hook 49 formed on one extension arm thereof. A link 51 connects another arm 52 extending from the latch lever 46 with one end of a trigger bar 53, which trigger bar is pivotally mounted on a stud 54 secured in the supporting yoke 33. The lower end of the connecting link 51 is fastened to the latch arm 52 by means of a poppet pin 55, whichpin has an enlarged head 56 and a clearance opening 57 within said head. A stud 58 extending outward from the supporting yoke 33 directly beneath the head 56, has an enlarged head 59 in which a pin 61 is secured and extends upwardly through the clearance opening 57 in the poppet pin head 56. By means of a compression spring 62, which is placed over said pin 61 and engages the two heads 56 and 59, a tension is provided which tends to force the link 51 upward and cause a finger 63 formed on the trigger bar 53 to contact a pin 64 extends ing outward from the tension roller bearln block 29.

The drop roller 26 is mounted in end bearings 65 formed in the ends of arms 66, one of which arms is shown in the drawing as pivotally mounted on shaft 67 carried by the aforementioned brackets 23. A dog 68 is secured to one of the arms 66 which is adapted to be engaged by the latch bar hook 49 when the mechanism is in the position shown in Figure 3 and the web is running under normal tension.

It will thus be observed that while the mechanism is in the position shown in Figure 3, the drop roller will be locked in a fixed position by the engagement of the hook 49 of the latching lever 46 with the dog 68 or the drop roller arm 66 and will remain in this position so long as the press is running normally. Just as soon however as a slack occurs in the web W, the tension roller bearing block 29 will move upward, which move ment will cause the pin 64 on said bearing block 29 to rock the trigger bar 53 about its pivotal stud 54 and thereby rock the latch lever 46 about the stud 4'7, through the link connection 51, to release the hook 49 of said latch lever 46 from engagement with the dog 68. The drop roller will then be permitted to drop the distance required to take up the existing slack but immediately upon the return of the press mechanism to normal speed, the drop roller will be drawn upward until the end bearing 65 engages a stop pad 69 secured on the press frame, after which the normal running tension of the web .W will cause the bearing block 29 to be drawn downward to reset the latching lever hook 49 with the dog 63 on the drop roller arm.

It will be observed from the foregoing that the unlatching and resetting operationsiare entirely automatic and that the mechanism provided for producing the results explained is of simple and efficient construction.

While the invention has been shown and de- 3 scribed in its preferred form, it will be understood that certain changes and variations may be made in the specific structure provided for carrying out the invention without, however, departing from the spirit of the invention as defined in the appended, claims.

What is claimed is:

1. In a web supply mechanism for a machine operating upon a web, means for rotatably supporting a web supply roll in feeding position, a roller around which the web is led, means for holding the roller in normal running position, and means for releasing the roller when excess web is fed from the supply roll.

2. In a web supply mechanism for a machine operating upon'a web, means for rotatably supporting a web supply roll in feeding position, a roller around which the web is led, means for holding the roller in normal running position, means for releasing the roller to take up excess web when there is an excess feed from the supply roll, said roller being adapted to be returned to its normal running position by the pull of the web when normal feeding is resumed.

3. In a web supply mechanism for a machine operating upon a web, means for rotatably supporting a web supply roll in feeding position, a roller around which the web is led, means for holding the roller in a fixed position under normal running conditions of the web and means for releasing the roller when excess web is fed from the supply roll, said roller being adapted to be returned to its normal running position by the pull of the web when normal feeding is resumed.

4. In a web supply mechanism for a machine operating upon a web, means for rotatably supporting a web supply roll in' feeding position, a tension roller and a drop roller around which said web is led, means for holding the drop roller in a fixed position under normal running conditions of the web, and means for releasing the drop roller when tension on the tension roller is decreased.

5: In a web supply mechanism for a machine operating upon a web, means for rotatably supporting a web supply roll in feeding position, a tension roller and a drop roller around which said web is led, means for holding the drop roller in a fixed position under normal running conditions of the web, and means for releasing the drop roller when tension on the tension roller is decreased, said drop roller being adapted to be returned to the fixed position by the pull of the web when normal web feeding is resumed.

6. In a web supply mechanism for a machine operating upon a web, comprising in combination, a web supply roll supported in feeding position, a tension roller and a drop roller around which said web is led, a latch mechanism for holding the drop roller in a fixed position while the web 'is feeding under a normal tension; and means for releasing the latch mechanism to permit the drop roller to move downward .and take up slack produced when excess web is fed from the web supply roll.

7. In a web supply mechanism for a machine operating upon a web, comprising in combination, a web supply roll supported in, feeding position, a tension roller and a drop roller around which said web is led, a latch mechanism for holding the drop roller in a fixed position ,while the web is feeding under a normal tension, and means for releasing the latch mechanism to permit the drop roller to move downward and take up slack produced when excess web is fed from 'the web supply roll, said drop roller being adapted normal "web feeding is resumed.

8-. In a web supply mechanism for a machine operating upon a web, comprising in combination, a web supply roll, supported in feeding position, a tension roller mounted in slidable bearings and a drop roller mounted in arms, latch mechanism, a dog secured to a drop roller arm and adapted to be engaged by the latch mechanism to hold the drop roller in normal running position, and means actuated by the movement of a tension roller bearing for tripping the latch mechanism when tension on the tension roller is decreased, to permit the drop roller to move downward and take up slack produced when excess web is fed from the web supply roll.

9. In a web supply mechanism for a machine operating upon a web, comprisin in combina-' tion, a web supply roll supported in feeding position, a tension roller mounted in slidable bearings and a drop roller mounted in arms, latch mechanism, a dog secured to a drop roller arm and adapted to be engaged by the latch mechanism to hold the drop .roller in a normal running position, and means actuated by the movement of a tension roller bearing for tripping the latch mechanism when tension on the tension roller is decreased, to permit the drop roller to move downward and take up slack produced when excesswebis fed from the web supply roll, said dog on the drop roller arm being adapted to become reengaged with the latch mechanism when the drop roller is returned by the pull of the web after normal web feeding is resumed;

10. In a web supply mechanism for a machine operating upon a web, including in combination,

a web supply, a tension roller and a drop roller around which the web is led, latch means for holding the drop roller in a raised position while the web is feeding under normal tension, and means for releasing said latch means to permit a downward movement of the drop roller when the normal web tension is decreased and thereby take up any slack in the web.

11. In a web supply mechanism for a machine operating upon a web, including in combination, a web supply, a tension roller and a drop roller around which the web is led, latch means for holding the drop roller in a raised position while the web is feeding under normal tension, and means actuated by the tension roller for releasing said latch means to permit a downward movement of the drop roller when the normal web tension is decreased, said drop roller being adapted to be returned to its latched position by the pull of the web when normal web feeding is resumed.

12. In a web supply mechanism for a machine operating upon a web, including in combination, a web supply, a floating spring tensioned roller, and a drop roller around which said web is led, latching mechanism for holding the drop roller in a raised position while the web is feeding under normal tension, and means actuated by the tension roller, when a change of position occurs due to a decrease in the running web tension, to release the latching mechanism and permit a downward movement of the drop roller to take up slack in the web. 13. In a web supply mechanism for a machine operating upon a web, including in combination, a web supply, a tension roller and a drop roller around which the web is led, rocker arms in which the drop roller is mounted and a latch mechanism engaging one of said rocker arms to retain the drop roller in a raised position while the web is feeding under normal tension, and a latch tripping means actuated by the movement of the tension roller when the web tension on said roller is decreased whereby the drop roller is released to take up slack in the web.

' 14. In a web supply mechanism for a machine operating upon a web, including in combination, a web supply, a tension roller and a drop roller around which the web is led, a mounting for said drop roller, a latching mechanism adapted to retain the drop roller mounting in a raised position,. said latching mechanism comprising a trigger actuated latch lever, and a dog on the drop roller mounting adapted to engage the latch lever when the said mounting is raised and the web is feeding normally, and means on said tension roller to trip the trigger actuated latch lever when a slack occurs in the web and causes a change of position of the tension roller, whereby the latch lever becomes disengaged from the dog and the drop roller moves downward to take up the slack. 15. In a web supply mechanism for a machine operating upon a web, including in combination, a web supply, a tension roller mounted in grooved bearings, supports having ways upon which the grooved bearings are adapted to slide, springs engaging both the upper and lower surfaces of each bearing, means for varying the tension of certain of said springs and a drop roller supported in bearings formed on supporting arms, said drop roller and tension roller. having the web led around each, alatching mechanism engaging a dog on one drop roller arm to lock the drop roller in a raised or normal running position, means on one tension roller bearing to trip the latching mechanism when the tension roller bearings move upward by a decrease in web tension, and thereby release the drop roller to take up any additional slack in the web.

' FREDERICK LAMATSCH. 

